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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d092a1166c63e8fc4ca715168927f73b7e508bf8f65b84f3d4640c868ea34a' 
  AND token = 'g+AU5EPxMVmTAUE0ht7jH3KuT95LJM0IDMVrVpdgJFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}